It's the same old club room, but the vibe between Io and Ryuu has changed. Have they had a fight? But then again, the others reason, they didn't get along very well back when they first joined the club... Then, when a fight breaks out, the cold war between the two second-years ends up getting the Battle Lovers in big trouble!
See, this is what we call 
a benefit-cost ratio.
Das ist doch mal ein gutes Investment.
Eso se llama relación costo-beneficio.
Eso se llama relación costo-beneficio.
Sapete, è una questione
di rapporto costi-benefici.
Sabe, isso é o que chamamos 
 de relação custo-benefício.